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Catherine, Duchess of Cambridge, Kate Middleton

Alastair Grant - WPA Pool/Getty Images

The Duchess of Cambridge is wearing holiday cheer from head to toe. 

Ahead of Christmas, Kate Middleton stepped out in her holiday best on Monday to attend a party hosted by The Mix and Heads Together, the campaign she, Prince William and Prince Harry spearheaded to combat mental health stigmas. 

Of course, the royal mother of two was not going to arrive without picture-perfect threads. The 34-year-old sported a red and green floral print frock designed by Vanessa Seward and accessorized with a pair of hoop earrings, a black belt, a simple black clutch and pumps. The look was just what Santa ordered. 

Prince Harry, Catherine, Duchess of Cambridge, Kate Middleton, Prince William, Duke of Cambridge

Alastair Grant - WPA Pool/Getty Images

At their last royal event for 2016, the trio mingled with volunteers, counselors and supporters involved with Heads Together at a youth club in London.

While Prince William was not without his wife of five years, Prince Harry went solo for the event after escorting his girlfriend, American television star Meghan Markle, to London's Heathrow Airport on Sunday. 

Kate Middleton

Mark Cuthbert/UK Press via Getty Images

The three kept busy doing arts and crafts with fellow guests while Prince William chatted about a certain tot getting into the Christmas spirit back at home. 

"He just said [PrinceGeorge definitely knows it's Christmas this year because the presents are about and he's more into opening them than anything else," DJ AJ King told reporters of his conversation with Prince William. 

"I said Christmas would be a bit different for his children this year and he said they would be having a family Christmas together."

"He was saying the family is so important, it's really important to preserve these family values," another attendee added.